Method and system for recovering copper, zinc and cyanide in cyanidation gold extraction of high-copper gold mines

Abstract

The invention provides a method and system for recycling copper zinc and cyanide from high-copper gold ore cyanide gold refining. Sodium cyanide is adopted to leach copper-bearing gold ore, ultrafiltration and nanofiltration membrane concentration are carried out on a leaching agent, concentrated acid and dissolvable sulfide are sequentially put into concentrated liquor, Cu2S (copper sludge) is produced, the copper sludge can be recycled after water removal, and copper-dissolved sodium cyanide is recycled synchronously; lime milk is added into a liquid supernatant to adjust the pH value, the liquid supernatant obtained after solid-liquid separation is mixed with the nanofiltration membrane leaching agent, and then has a replacement reaction with zinc powder to generate gold, ultrafiltration and nanofiltration membrane concentration are carried out on a barren solution, concentrated acid and soluble sulfide are put into concentrated liquor sequentially, ZnS (zinc sludge) is generated, and recycled after water removal, and zinc-dissolved cyanide is recycled synchronously; and the lime milk is added into the liquid supernatant to adjust the pH value, and the liquid supernatant obtained after solid-liquid separation is mixed with the nanofiltration membrane leaching agent and returns to a leaching pool. The copper zinc and the cyanide are recycled, and therefore the problem that copper-bearing gold ore is high in leaching cost is solved; and meanwhile, the zero discharging of the cyanide liquid in the whole technology is achieved.

Description

technical field

[0001] The present invention is an improved cyanide gold extraction method and system, specifically a method and system for recovering copper, zinc and cyanide in cyanide gold extraction of high-copper gold mines, which can recover copper and zinc in cyanide gold extraction metals and cyanides. Background technique

[0002] Merrill-Crowe cyanide gold extraction is the most commonly used method for extracting gold from gold mines in modern times. It has been used since 1889 and has a history of more than 100 years. It has the advantages of simplicity, economy, high recovery rate, and strong adaptability. The cyanidation gold extraction process usually includes a leaching process and a zinc powder replacement process. The leaching process is to leaching gold ore with a cyanide solution under the condition of sufficient oxygen supply, so that gold and cyanide form a gold complex and dissolve to produce precious metals. In addition, in order to maintain the stab...

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